Now launch Redsnow in Administrator mode by right clicking on the .exe icon . Skip this step if you see UAC Virtualization is disabled or grayed out . [Windows 7 user may run in XP Compatibility Mode by clicking Troubleshoot Compatibility] . All these steps may not be required for all Windows users , however if you face any errors during the process , consider enabling them .

Now goto Task Manager by right clicking on your Windows Taskbar and set the affinity mode of the process to CPU 1 [in task manager as shown below]. This will help you bypass the “Uploading RamDisk” Error causing during the process of creating custom ipsw file .

Now browse to the downloaded 4.3.1 ipsw file in step 3 and select it on Redsn0w as shown in the image below .

Redsnow will then verify the ipsw file and you can proceed by clicking on Next button at bottom right to Install Cydia.

Turn off your device and plugin to the computer . Get ready to put your device in DFU Mode as asked by Redsnow . Click Next to proceed with DFU Mode . Read How to Put Your device in DFU Mode .

After successfully entering DFU mode , you will be able to jailbreak your device un-tethered . Wait for Redsnow to complete the jailbreak process by itself. Your device will reboot and you will be jailbroken .